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José F. Siqueira Jr., D.D.S., M.Sc., Ph.D.


Dr. Siqueira is the chair of endodontics, director of the postgraduate program in endodontics, and head of the molecular microbiology laboratory at Iguaçu University, in Rio de Janeiro, Brazil. He is also professor of the postgraduate program in endodontics at Grande Rio University, also in Rio de Janeiro.

In 1989, he received his D.D.S. degree from Universidade Gama Filho School of Dentistry in Rio de Janeiro, and endodontic training at Federal University from 1991 to 1992. He received his Masters degree and Ph.D. in microbiology and immunology at Federal University in 1996 and 1998, respectively.

Dr. Siqueira has authored several books on endodontics and microbiology, several chapters for leading international endodontic textbooks and more than 430 scientific papers. His H-index, which measures both the productivity and impact of the published work of a scientist, is 77. Dr. Siqueira has received several international awards including the Louis I. Grossman Awards from the American Association of Endodontists in 2014 and French Endodontic Society in 2012, for cumulative publication of significant research studies that have made an extraordinary contribution to endodontics.

His primary research interests are in the areas of endodontic microbiology and infection control. Ongoing research includes studies on the composition of the endodontic microbiota associated with different forms of apical periodontitis, including the detection of uncultivated microorganisms, as well as the clinical strategies to deal with endodontic infections.

Contact information

Estácio de Sá University
Faculty of Dentistry
Rua Alfredo Baltazar da Silveira
580/cobertura, Recreio
Rio de Janeiro
Brazil 22790-710
Phone: 55 21 8874-1022
Fax: 55 21 2199-2204

Available Sessions

  • Microbiology of Apical Periodontitis
    Learning Objectives:

    1. To explain the infectious etiology and pathogenesis of primary and posttreatment apical periodontitis;
    2. To describe the basic aspects of endodontic infections, including microbial diversity and patterns of colonization
    3. To translate the knowledge of endodontic microbiology into clinical improvements in disinfection

    This presentation focuses on the diverse microbiological aspects of apical periodontitis. Topics of discussion include:
    o Causal relationships between microorganisms and apical periodontitis;
    o Pathogenesis of apical periodontitis–microbial pathogenicity and virulence;
    o Apical periodontitis as a disease caused by biofilms;
    o Routes of endodontic infections;
    o State-of-the-art methods for microbial identification;
    o Definition, microbiota and other characteristics of the different types of endodontic infections;
    o Causes of endodontic treatment failure;
    oRationale for antimicrobial treatment.


Dr. Siqueira has no proprietary, financial and/or personal interest pertaining to his presentation to disclose.

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